[JDK25] FopTest fails due to error reading event-model.xml

### Bug description

https://issues.apache.org/jira/browse/FOP-3275

```
Caused by: javax.xml.transform.TransformerException: java.util.MissingResourceException: Error reading event-model.xml: org.xml.sax.SAXException: FWK005 parse may not be called while parsing.
at java.xml/com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:790)
at java.xml/com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:395)
at org.apache.camel.component.fop.FopProducer.transform(FopProducer.java:98)
at org.apache.camel.component.fop.FopProducer.process(FopProducer.java:66)
at org.apache.camel.support.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:65)
at org.apache.camel.impl.engine.SharedCamelInternalProcessor.processNonTransacted(SharedCamelInternalProcessor.java:156)
at org.apache.camel.impl.engine.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:133)
at org.apache.camel.impl.engine.SharedCamelInternalProcessor$1.process(SharedCamelInternalProcessor.java:89)
at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:82)
at org.apache.camel.impl.engine.SharedCamelInternalProcessor.process(SharedCamelInternalProcessor.java:86)
at org.apache.camel.support.cache.DefaultProducerCache.send(DefaultProducerCache.java:180)
at org.apache.camel.impl.engine.DefaultProducerTemplate.send(DefaultProducerTemplate.java:175)
at org.apache.camel.impl.engine.DefaultProducerTemplate.send(DefaultProducerTemplate.java:171)
at org.apache.camel.impl.engine.DefaultProducerTemplate.requestBody(DefaultProducerTemplate.java:413)
```

Start by reproducing the FopTest failure on JDK25 and inspect the stack trace through org.apache.camel.component.fop.FopProducer, especially FopProducer.java:98 and the transform call. Determine why reading event-model.xml triggers the nested SAX parse error; done means FopTest passes without the MissingResourceException.

Written by the indexing model from the issue text.